package com.spring.shops.interceptor;
import com.spring.shops.constant.JwtClaimsConstant;
import com.spring.shops.context.BaseContext;
import com.spring.shops.properties.JwtProperties;
import com.spring.shops.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenAdminInterceptor implements HandlerInterceptor {
    //注入令牌属性
    @Autowired
    private JwtProperties jwtProperties;
    //controller方法调用之前拦截
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法（静态资源），直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getAdminTokenName());

        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getAdminSecretKey(), token);
            //拦截之后获取当前用户id
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.user_ID).toString());
            //设置当前用户的id
            BaseContext.setCurrentId(userId);
            log.info("当前用户id：{}", userId);
            //3、校验没有异常，通过，放行
            return true;
        } catch (Exception ex) {
            ex.printStackTrace();
            //4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}
